ocr: MEDIUM WAVES ONOSPHERE REFLECIED WAVE - 88 - . - - 1 - - - Radio waves travelin straight lines, SO you can always pick up a station whose transmitter 1S 1n your line of sight. But medium waves also reflect off the ionosphere (alayer ofthe Earth's atmosphere). This improves the range ofa broadcast, especially at night, when one layer of thei ionosphere becomes a better reflector.
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